A bit more info from Astra2D website
http://www.astra2d.com/freesat.htm
Although I believe there may be some misleading info on there
" It now seems likely that Channel Four, along with E4 and More4 will be part of the Freesat line-up from the official launch date. This may be the main reason for the delay in launching the Freesat platform.
Five will probably not join Freesat from its launch, due to contractual obligation with Sky Digital.
Channel Four's contract expires in 2008, it seems highly unlikely, that the broadcaster will renew an expensive encryption deal with Sky Digital, though they will remain on the platform.
Four's other channels, E4 and More4 are already FTA on digital terrestrial
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(not on my set up - just checked again - JCS)
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Film4 already broadcasts FTA via satellite and on Freeview.
Five's new channels, Five Life and Five US, which launched in October 2006, are both FTA on Freeview and FTV on satellite. It seems logical for Freesat to reserve epg numbers for Five's channel.